Welcome to the Board and to quilting. My sister sent me a website a while ago and while I haven't ever bought anything from it (I hate trying to match fabrics on a website and scrolling through upteen pages), their prices look good. I don't know what kind of quality they have (and you said you weren't concerned about that right now), so $2.99, $3.99 and $5.00 a yard fabrics might work great for you.
http://www.5bucksayard.com/